Survival in Pulmonary Hypertension Registries: The Importance of Incident Cases

www.chestpubs.org in the treatment of the patient who is critically ill. Moreover, in these patients, since the resting oxygen demands cannot be met, blood fl ow will be reduced through low-extraction tissues, such as the liver and gut, to be rerouted to essential tissues such as the brain; in this situation, the IVC Sv o 2 will reliably show an early decrease, indicating tissue hypoxia. 3 The study by Davison et al 1

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